Decade: 1990s

Smelling burnt toast is not a typical or reliable symptom of stroke. While unusual smells can occur in certain neurological conditions — such as temporal lobe seizures — olfactory hallucinations are rare in stroke and should not be considered a common warning sign.

Cracking your knuckles does not cause arthritis. Multiple studies have found no link between habitual knuckle cracking and the development of arthritis, despite the long-standing belief to the contrary.

The idea that humans only use 10% of their brains has been widely circulated, but neuroscience shows that almost every part of the brain has a function and is active over a normal day.